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While gauge sizes and ounce sizes are still used in many industries it is best to specify sheet metal by dimension. The #20 copper on this page is probably 20 gauge since it is stated that high numbers are thinner. 20 gauge = .032" (.75 mm).
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Learning metalworking, metalcraft. Metal trade education. Hobbysmith. TOOLS page 14, bowls, boxes, trays, If a boy can make all these models he can make nearly anythiung in copper or silver. Lets make drawings of bowls. Sheet copper. |
Working in Metals by Charles C. Sleffel